Nikon F4S, F4 Body Only instruction manual Rear-Curtain Sync Flash Photography

Rear-Curtain Sync Flash Photography

When using the Nikon SB-24, you can synchronize the flash to the instant just before the rear (second) curtain starts moving. Set the SB-24'sflash sync mode selector to "REAR." This lets you turn available light into a stream of light that follows the flash illuminated subject. Rear-curtain sync flash photography is especially effective at slower shutter speeds.

In PH, P or A mode, shutter will operate as slowly as 30 seconds, depending on the background brightness.

Front-curtain sync

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